Updated on 2026/07/15

写真a

 
OBASE TOMOYA
 
Organization
School of Science Researcher
Title
Researcher
External link

Degree

  • Ph.D. (Science) ( 2020.3   Tohoku University )

Research Interests

  • Volcanic gas

  • Mantle

  • Noble gas mass spectrometry

  • Cosmochemistry

  • Geochemistry

  • Meteorites

  • Solar wind

Research Areas

  • Natural Science / Space and planetary sciences

  • Natural Science / Solid earth sciences

Education

  • Tohoku University   Graduate School of Science

    2015.4 - 2020.3

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  • Tohoku University   Faculty of Science

    2011.4 - 2015.3

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Research History

  • Institute of Science Tokyo   School of Science   Postdoctoral Researcher

    2024.10

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  • Tokyo Institute of Technology   School of Science   Postdoctoral Researcher

    2024.4 - 2024.9

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  • Hokkaido University   Faculty of Science

    2022.4 - 2024.3

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  • The University of Tokyo   Graduate School of Arts and Sciences

    2020.4 - 2022.3

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Professional Memberships

Papers

  • Spatial and Temporal Variations in Helium Isotope Ratios of Fumaroles and Hot/Cold Spring Gases at the Kirishima Volcanic Group Reviewed

    Hirochika SUMINO, Nanae FUKUSHIMA, Rai YONEDA, Kotaro TOYAMA, Tomoya OBASE, Yuki YASUDA, Muga YAGUCHI, Jun-ichiro ISHIBASHI, Takeshi OHBA

    Journal of Geography (Chigaku Zasshi)   2026.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.5026/jgeography.135.267

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  • Depth-dependent mass fractionation of solar wind noble gases in lunar ilmenites revealed by high-resolution depth profiling Reviewed

    Yuta Otsuki, Ken-ichi Bajo, Tomoya Obase, Rainer Wieler, Hisayoshi Yurimoto

    Earth and Planetary Science Letters   2026.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.epsl.2026.120000

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  • He, Ne, and Ar isotope systematics in Chang’e-5 plagioclase reveal diffusive loss and reirradiation processes Reviewed

    Xuhang Zhang, Fei Su, Guillaume Avice, David V. Bekaert, Tomoya Obase, Yuta Otsuki, Finlay M. Stuart, Yingnan Zhang, Jiayan Nie, Xiaoguang Li, Runqing Zhou, Ziheng Liu, Youjuan Li, Jiannan Li, Thomas Smith, Huaiyu He

    Earth and Planetary Science Letters   2025.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.epsl.2025.119666

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  • Evidence of solar wind irradiation on mineral grains embedded in matrix of the Northwest Africa 801 CR chondrite Reviewed

    Sohei Wada, Ken‐ichi Bajo, Tomoya Obase, Hisayoshi Yurimoto

    Meteoritics & Planetary Science   2025.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    <jats:title>Abstract</jats:title><jats:p>Solar wind (SW) is preserved in meteorites as abundant solar noble gases. We performed in situ <jats:sup>4</jats:sup>He isotope imaging of mineral grains in the CR2 chondrite matrix of Northwest Africa 801 using time‐of‐flight secondary neutral mass spectrometry with strong‐field post ionization. <jats:sup>4</jats:sup>He<jats:sup>+</jats:sup> signals were detected along the surfaces of individual grains of Fe‐Ni metal, ferrihydrite, olivine, pyroxene, and troilite. The high <jats:sup>4</jats:sup>He concentrations along the surfaces indicate implantation of SW into the mineral grains. We determined the SW‐<jats:sup>4</jats:sup>He fluence of eight mineral grains from the line profiles across the grain boundaries. SW‐<jats:sup>4</jats:sup>He fluence ranged from 2.7 × 10<jats:sup>16</jats:sup> to 58 × 10<jats:sup>16</jats:sup> atoms cm<jats:sup>−2</jats:sup>. These fluences were then used to calculate the SW irradiation durations. Assuming irradiation occurred at 4 astronomical units, the durations ranged from 3.8 to 82 kyr. These durations correspond to the residence time of individual mineral grains on the surface of the parent body. The variation in residence time for the mineral grains suggests variable durations for local mixing and burial processes on the parent body. The SW exposure ages provide insights into the gardening rate driven by small‐scale impact mixing processes on the parent body.</jats:p>

    DOI: 10.1111/maps.14346

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  • Extreme Solar Particle Ejection Event in the Last Few Million Years from Asteroid Itokawa Sample Reviewed

    Tomoya Obase, Ken-ichi Bajo, Yuta Otsuki, Hisayoshi Yurimoto

    The Astrophysical Journal   2025.1

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

    DOI: 10.3847/1538-4357/ad9919

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  • Depth profiling of noble gases in ilmenite and olivine substrates Reviewed

    Yuta Otsuki, Ken-ichi Bajo, Tomoya Obase, Hisayoshi Yurimoto

    Journal of Analytical Atomic Spectrometry   2025

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    Language:English   Publishing type:Research paper (scientific journal)  

    <jats:p>Solar wind noble gases in extraterrestrial materials provide important insights into past solar activity and space weathering processes. These noble gases are concentrated within the uppermost 100 nm of material...</jats:p>

    DOI: 10.1039/d4ja00430b

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  • Past solar wind flux recorded in solar-gas-rich meteorites Reviewed

    Tomoya Obase, Daisuke Nakashima

    Icarus   389   115290 - 115290   2023.1

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.icarus.2022.115290

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  • Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases Reviewed

    Tomoya Obase, Hirochika Sumino, Kotaro Toyama, Kaori Kawana, Kohei Yamane, Muga Yaguchi, Akihiko Terada, Takeshi Ohba

    Scientific Reports   12 ( 1 )   2022.12

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/s41598-022-22280-3

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  • Water-susceptible primordial noble gas components in less-altered CR chondrites: A possible link to cometary materials Reviewed

    Tomoya Obase, Daisuke Nakashima, Jisu Choi, Yuma Enokido, Megumi Matsumoto, Tomoki Nakamura

    Geochimica et Cosmochimica Acta   312   75 - 105   2021.11

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.gca.2021.08.012

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  • Cosmic‐ray exposure age and heliocentric distance of the parent body of the Rumuruti chondrite PRE 95410 Reviewed

    Tomoya Obase, Daisuke Nakashima, Tomoki Nakamura, Keisuke Nagao

    Meteoritics & Planetary Science   55 ( 5 )   1031 - 1047   2020.5

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/maps.13481

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MISC

  • Volcanic Activity Assessment Using Time Variations of Helium Isotope Ratios Around Ebinokogen Iwo-yama, Kirishima Volcanic Group

    Nanae FUKUSHIMA, Hirochika SUMINO, Takeshi OHBA, Muga YAGUCHI, Jun-ichiro ISHIBASHI, Yuki YASUDA, Tomoya OBASE, Kotaro TOYAMA, Takeshi MATSUSHIMA

    Technical Note of the National Research Institute for Earth Science and Disaster Resilience   523   102 - 106   2026.3

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    Language:Japanese   Publisher:National Research Institute for Earth Science and Disaster Resilience 言語  

    Technical Note of the National Research Institute for Earth Science and Disaster Resilience
    Proceedings of the Workshop of the Cooperation Research of the Integrated Program for Next Generation Volcano Research and Human Resource Development: How Does Volcanology Forecast the Style and Sequence of a Future Eruption ? - A Case Study on Kirishima Volcano -

    DOI: 10.24732/NIED.00007447

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  • Helium-rich clast in the MIL 090657 CR chondrite: Evidence for exposure to solar energetic particles from the pre-main-sequence Sun

    小長谷智哉, 馬上謙一, 松本恵, 和田壮平, 圦本尚義

    日本地球惑星科学連合大会予稿集(Web)   2024   2024

  • Development of Simultaneous in-situ Micro-analysis for He, Ne, and Ar Isotopes in Minerals by Isotope Nanoscope

    大槻悠太, 馬上謙一, 小長谷智哉, WIELER Rainer, 圦本尚義

    質量分析総合討論会講演要旨集   72nd   2024

  • Helium isotope imaging for CM chondrites

    小長谷智哉, 馬上謙一, 圦本尚義

    日本地球惑星科学連合大会予稿集(Web)   2024   2024

  • In-situ analysis of helium, neon, and argon isotopes in ilmenite and olivine

    大槻悠太, 馬上謙一, 小長谷智哉, WIELER Rainer, 圦本尚義

    日本地球惑星科学連合大会予稿集(Web)   2024   2024

  • Three-dimensional distributions of solar wind helium on the surfaces of Itokawa regolith particles

    小長谷智哉, 馬上謙一, 大槻悠太, 圦本尚義

    日本地球惑星科学連合大会予稿集(Web)   2023   2023

  • Magma-hydrothermal system of Kusatsu-Shirane volcano, Japan

    A Terada, W Kanda, Y Ogawa, T Yamada, M Yamamoto, H Aoyama, T Ohkura, T Ohba, M Yaguchi, H Sumino, T Obase

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2023   68 - 68   2023

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    Language:Japanese   Publisher:The Volcanological Society of Japan  

    DOI: 10.18940/vsj.2023.0_68

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  • Spatial distribution of Helium and Carbon isotope ratios in soil gas outside the Yugama crater at Kusatsu-Shirane volcano: The source of the soil gas

    K. Wakamatsu,, A. Terada,, H. Sumino,, T. Obase,, M. Yaguchi,, T. Ohba,

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2022   50 - 50   2022

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    Language:Japanese   Publisher:The Volcanological Society of Japan  

    DOI: 10.18940/vsj.2022.0_50

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  • Comparison of noble gas and CO2 compositions of petit-spot lava and mid-ocean ridge basalt

    Obase Tomoya, Sumino Hirochika, Hirano Naoto, Machida Shiki

    Abstracts of Annual Meeting of the Geochemical Society of Japan   69   60   2022

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    Language:Japanese   Publisher:GEOCHEMICAL SOCIETY OF JAPAN  

    DOI: 10.14862/geochemproc.69.0_60

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  • Spatial distribution of Helium isotope ratios in soil gas outside the Yugama crater at Kusatsu-Shirane volcano: An attempt to detect potential fracture zones

    若松海, 寺田暁彦, 角野浩史, 小長谷智哉, 谷口無我, 大場武

    日本火山学会講演予稿集   2021   56 - 56   2021

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    Language:Japanese   Publisher:The Volcanological Society of Japan  

    DOI: 10.18940/vsj.2021.0_56

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  • Temporal variations of helium and carbon isotopic compositions of fumarolic gases at Hakone volcano

    小長谷智哉, 角野浩史, 外山浩太郎, 大場武, 谷口無我

    日本火山学会講演予稿集   2021   2021

  • Temporal variation in the ratio of magmatic helium and argon in fumarolic gases at Kusatsu-Shirane volcano

    小長谷智哉, 角野浩史, 外山浩太郎, 外山浩太郎, 大場武, 谷口無我, 寺田暁彦

    日本地球化学会年会要旨集(Web)   68th   2021

  • Secular and spatial variations of helium isotope ratios in Izu Oshima

    角野浩史, 小長谷智哉, 外山浩太郎, 野津憲治, 池端慶, 清水綾

    日本火山学会講演予稿集   2021   2021

  • Migration pathways of magmatic fluids in the west of Kusatsu-Shirane volcano traced by helium and carbon isotope ratios of hot spring gases

    滝口孝寛, 小長谷智哉, 角野浩史, 寺田暁彦

    日本地球化学会年会要旨集(Web)   67th   2020

  • Quick report of the R/V Yokosuka and Shinkai 6500 YK16-01, YK19-05S Cruise-Preliminary 6K dive report on “petit-spot” volcano around Minamitorishima Island-

    石井輝秋, 金子誠, 町田嗣樹, 金子純二, 浅見慶志朗, 平野直人, 秋澤紀克, 松本亜沙子, 田中えりか, 油谷拓, 進士優朱輝, 小長谷智哉, 長谷川貴章, 木野聡志, 大嶋ちひろ, 坂本衣里, 井和丸光

    深田地質研究所年報   ( 21 )   2020

  • Temporal and spatial variations of helium isotope ratios at Kirishima volcanic group

    角野浩史, 外山浩太郎, 小長谷智哉, 滝口孝寛, 大場武, 谷口無我

    日本火山学会講演予稿集   2020   2020

  • Noble gas isotopes of fumaroles and hot-spring gases at Kusatsu-Shirane volcano

    小長谷智哉, 角野浩史, 外山浩太郎, 川名華織, 山根康平, 大場武, 谷口無我, 寺田暁彦

    日本火山学会講演予稿集   2020   2020

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Presentations

  • MIL090657隕石の微小領域ヘリウムイメージング

    小長谷智哉, 馬上謙一, 和田壮平, 圦本尚義

    日本質量分析学会 同位体比部会  2023.11 

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    Event date: 2023.11

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  • Q-like Ne Hosted by Water-Susceptible Phase in Primitive CR Chondrite: A Possible Link to Cometary Materials

    Obase T, Nakashima D, Choi J, Enokido Y, Matsumoto M, Nakamura T

    The 85th Annual Meeting of the Meteoritical Society  2022.8 

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    Event date: 2022.8

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  • Helium-rich clast in the MIL 090657 CR chondrite: Evidence for exposure to solar energetic particles from the pre-main-sequence Sun

    Tomoya Obase, KEN-ICHI BAJO, Megumi Matsumoto, Sohei Wada, Hisayoshi Yurimoto

    Japan Geoscience Union meeting 2024  2024.5 

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  • MIL090657隕石中のHeに富む粒子の岩石鉱物学的特徴

    小長谷智哉, 馬上謙一, 松本恵, 和田壮平, 圦本尚義

    惑星物質科学のフロンティア研究集会  2024.3 

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  • Evidence for exposure to solar energetic particles from the young Sun

    Obase T, Bajo K, Wada S, Matsumoto M, Yurimoto H

    Solar System symposium in Sapporo 2024  2024.2 

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    Language:English   Presentation type:Oral presentation (general)  

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  • Three-dimensional distributions of solar wind helium on the surfaces of Itokawa regolith particles

    Tomoya Obase, Ken-ichi Bajo, Yuta Otsuki, Hisayoshi Yurimoto

    Japan Geoscience Union meeting 2023  2023.5 

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  • Noble gas and CO2 compositions of petit-spot magma Invited

    Tomoya Obase, Hirochika Sumino, Shiki Machida, Naoto Hirano

    Japan Geoscience Union meeting 2023  2023.5 

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  • 宇宙風化作用を経験したイトカワ粒子表面の太陽風ヘリウム分布

    小長谷智哉, 馬上謙一, 大槻悠太, 圦本尚義

    惑星物質科学のフロンティア研究集会  2023.3 

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  • Nanoscale depth profiling of solar wind helium on Itokawa particle

    Obase T, Bajo K, Otsuki Y, Yurimoto H

    Solar System symposium in Sapporo 2023  2023.2 

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  • 隕石の希ガス同位体組成に記録された過去の太陽風フラックス

    小長谷智哉, 中嶋大輔

    第24回惑星圏研究会  2023.2 

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  • Noble gas and CO2 compositions of the source mantle of a petit spot volcano on the west Pacific Plate

    Tomoya Obase

    2024.9 

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  • トータルエバポレーションTIMSによるカリウム同位体測定の試み

    小長谷智哉, 横山哲也

    日本質量分析学会 同位体比部会  2025.12 

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  • 鉄隕石中カリウム抽出法の開発

    小長谷智哉, 横山哲也

    日本地球化学会第72回年会  2025.9 

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  • Helium-rich schreibersite in CR chondrite: evidence for energetic young Sun

    2025.9 

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  • Helium-Rich Schreibersite in CR Chondrite: Evidence for Energetic Young Sun

    Obase T., Bajo K., Matsumoto M., Wada S., Yurimoto H.

    The 87th Annual Meeting of the Meteoritical Society  2025.7 

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    Language:English   Presentation type:Oral presentation (general)  

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  • 塩酸–2-プロパノール混合溶液中のアニオン交換樹脂への29元素の分配係数

    小長谷智哉, 横山哲也

    Japan Geoscience Union meeting 2025  2025.5 

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  • Energetic solar activity from the first million years to present: Insights from noble gases in planetary materials Invited

    Obase T., Bajo K., Matsumoto M., Nakashima D., Wada S., Otsuki Y., Yurimoto H.

    Japan Geoscience Union meeting 2025  2025.5 

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  • MORB-like mantle noble gases beneath the oldest oceanic plate Invited

    Obase T., Sumino H., Mikuni K., Machida S., Hirano N.

    Japan Geoscience Union meeting 2025  2025.5 

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  • Extreme Interplanetary Coronal Mass Ejections Recorded in Genesis and Asteroid Itokawa Samples

    Obase T., Tonotani A., Bajo K., Otsuki Y., Reisenfeld D. B., Jurewicz A. J. G., Burnett D. S., Yurimoto H.

    40th Lunar and Planetary Science Conference  2025.3 

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  • 鉄隕石中カリウム抽出法の開発

    小長谷智哉, 横山哲也

    日本質量分析学会 同位体比部会  2024.11 

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  • 草津白根山の噴気ガスに含まれる希ガスの起源と元素・同位体比分別

    小長谷智哉, 角野浩史, 外山浩太郎, 川名華織, 山根康平, 大場武, 谷口無我, 寺田暁彦

    日本質量分析学会同位体比部会2020  2020.11 

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  • 草津白根火山周辺の噴気ガス・温泉ガス中の希ガス同位体組成

    小長谷智哉, 角野浩史, 外山浩太郎, 川名華織, 山根康平, 大場武, 谷口無我, 寺田暁彦

    日本火山学会2020年度秋季大会  2020.10 

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  • Past Solar Wind Fluxes at the Locations of Gas-Rich Meteorite Parent Bodies Based on Noble Gas Studies: Implications to the Past Heliocentric Distances

    Obase T, Nakashima D

    The 82nd Annual Meeting of the Meteoritical Society  2019.7 

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  • ミュオン元素分析の隕石研究への応用

    小長谷智哉

    新学術領域研究「宇宙観測検出器と量子ビームの出会い。新たな応用への架け橋。」若手ハードウェア研究会  2019.3 

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  • Solar wind noble gases in the Rumuruti chondrite PRE95410 and heliocentric distance of the meteorite parent body: implication to inward migration

    Obase T, Nakashima D, Nakamura T, Nagao K

    Earth, Sea and Sky III: International Joint Graduate Program Workshop in Earth and Environmental Sciences  2018.5 

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  • Cosmic-ray exposure age and heliocentric distance of the parent body of the rumuruti chondrite PRE 95410

    Obase T, Nakashima D, Nakamura T, Nagao K

    Japan Geoscience Union meeting 2015  2015.5 

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  • 草津白根山噴気中のマグマ起源ヘリウム・アルゴン比の時間変動

    小長谷智哉, 角野浩史, 外山浩太郎, 大場武, 谷口無我, 寺田暁彦

    日本地球化学会第68回年会  2021.9 

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  • Temporal variations in helium and argon isotopic compositions of fumarolic gases at Kusatsu-Shirane volcano, Japan

    Obase T, Sumino H, Toyama K, Ohba T, Yaguchi M, Terada A

    Goldschmidt2021  2021.7 

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  • Temporal variations of helium and carbon isotopic compositions of fumarolic gases from Kusatsu-Shirane volcano

    Obase T, Sumino H, Toyama K, Ohba T, Yaguchi M, Terada A

    Japan Geoscience Union meeting 2021  2021.6 

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  • Primordial noble gas component hosted by water-susceptible materials in less-altered CR chondrites Invited

    Tomoya Obase

    PRL PLATINUM PLANETARY SEMINAR SERIES, Physical Research Laboratory, India  2022.6 

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    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • Temporal variations in helium and carbon isotopic compositions of fumarolic gases from Ioyama volcano, Kirishima volcanic group

    Obase T, Sumino H, Toyama K, Ohba T, Yaguchi M, Ishibashi J

    Japan Geoscience Union meeting 2022  2022.5 

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  • レゴリス角礫岩質隕石に記録された過去の太陽風フラックス

    小長谷智哉

    「惑星科学のフロンティア」研究集会  2022.3 

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  • 太平洋プレート西端直下マントルの希ガス同位体組成

    小長谷智哉, 角野浩史, 町田嗣樹, 平野直人

    東京大学地震研究所共同利用研究集会「海溝海側の過程に関する横断的研究:沈み込み帯インプットの実態解明を目指して(第 2 回)  2022.3 

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  • レーザー抽出法を⽤いたプチスポット⽞武岩急冷ガラス気泡中の希ガス同位体分析

    小長谷智哉, 角野浩史, 町田嗣樹, 平野直人

    日本質量分析学会同位体比部会2021  2021.11 

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  • 太平洋プレート西端直下マントルの希ガス同位体組成

    小長谷智哉, 角野浩史, 町田嗣樹, 平野直人

    InterRidge-Japan研究集会  2021.11 

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  • 箱根火山噴気の希ガス・炭素同位体組成の時間変動

    小長谷智哉, 角野浩史, 外山浩太郎, 大場武, 谷口無我

    日本火山学会2021年秋季大会  2021.10 

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  • イトカワ粒子に打ち込まれた太陽風ヘリウムの微小領域三次元分布

    小長谷智哉, 馬上謙一, 大槻悠太, 圦本尚義

    日本質量分析学会同位体比部会  2022.12 

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  • プチスポット溶岩と中央海嶺玄武岩の希ガス・CO2組成の比較

    小長谷智哉, 角野浩史, 町田嗣樹, 平野直人

    日本地球化学会第69回年会  2022.9 

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  • 初期太陽系物質に打ち込まれた太陽高エネルギー粒子の発見

    小長谷智哉, 馬上謙一, 松本恵, 和田壮平, 圦本尚義

    惑星物質科学のフロンティア研究集会  2026.3 

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Awards

  • The Elsevier Travel Award for the 85th Annual Meeting of the Meteoritical Society

    2022.8  

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Research Projects

  • カリウム同位体分析で探る分化天体の揮発性元素枯渇プロセス

    Grant number:25K17457  2025.4 - 2028.3

    日本学術振興会  科学研究費助成事業  若手研究

    小長谷 智哉

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    Grant amount:\4810000 ( Direct Cost: \3700000 、 Indirect Cost:\1110000 )

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  • 隕石の同位体分析に基づく太陽風フラックス進化履歴の解明

    Grant number:24KJ1039  2024.4 - 2027.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    小長谷 智哉

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    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

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  • 微小領域希ガス同位体イメージングに基づく始原隕石中の彗星物質の特定

    Grant number:22K20376  2022.8 - 2024.3

    日本学術振興会  科学研究費助成事業 研究活動スタート支援  研究活動スタート支援

    小長谷 智哉

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    Grant amount:\2860000 ( Direct Cost: \2200000 、 Indirect Cost:\660000 )

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  • 沈み込む太平洋プレート直下の上部マントル希ガス同位体組成の解明

    Grant number:2021-6034  2021.4 - 2022.2

    日本科学協会  笹川科学研究助成 

    小長谷智哉

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    Authorship:Principal investigator 

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Teaching Experience

  • 宇宙・地球科学

    2026.6 - 2026.7 Institution:工学院大学

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  • 科学基礎実験NOK:化学実験

    2026.5 - 2026.7 Institution:東京科学大学

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